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PRINCIPAL ACCOUNTING POLICIES - Other income/ (expense) (Details) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Other income/ (expense) |  |  |  |
Gain on deconsolidation of subsidiaries(Note 18) |  |  |  | ¥ 1,091
Government grants | ¥ 618 |  | ¥ 550 | 601
Foreign exchange (losses)/gains | (69) |  | 1 | (40)
(Loss)/gain on disposal of long-term investments (Note 7) | 23 | $ 3 | 63 | (602)
Gain from the fair value remeasurement upon the discontinuance of the equity method of the investments | 1,135 | 165 |  |
Fair value changes of equity securities investments and Exchangeable Senior Notes | 1,338 |  | (170) | (612)
Impairments of long-term investments | (949) | (138) | (96) | (905)
Others | (81) |  | 25 | 194
Total | ¥ 2,015 | $ 292 | ¥ 373 | ¥ (273)

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- Definition Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=125521441&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123602790&loc=d3e30226-110892 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 10 -Section 45 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=126980362&loc=d3e28228-110885 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124440516&loc=d3e30840-110895 + Details
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